# The LearningOnline Network with CAPA
#
# Sequence Handler
#
# $Id: lonsequence.pm,v 1.12 2002/05/24 14:44:32 www Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# (Handler to resolve ambiguous file locations
#
# (TeX Content Handler
#
# 05/29/00,05/30,10/11 Gerd Kortemeyer)
#
# 10/11,10/12 Gerd Kortemeyer)
#
# 10/16 Gerd Kortemeyer
package Apache::lonsequence;
use strict;
use Apache::lonnet;
use Apache::Constants qw(:common :http REDIRECT);
use GDBM_File;
use Apache::lonratedt;
use Apache::lonratsrv;
use Apache::lonpageflip;
my %selhash;
my $successtied;
# ----------------------------------------- Attempt to read from resource space
sub attemptread {
my $fn=shift;
&Apache::lonnet::repcopy($fn);
if (-e $fn) {
return &Apache::lonratedt::attemptread($fn);
} else {
return ();
}
}
# ---------------------------------------------------------------- View Handler
sub viewmap {
my ($r,$url)=@_;
$r->print('<html>');
if ($ENV{'form.forceselect'}) { $r->print(<<ENDSCRIPT);
<script>
function select_group() {
window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
}
function queue(val) {
if (eval("document.forms."+val+".filelink.checked")) {
var l=val.length;
var v=val.substring(4,l);
document.forms.fileattr.acts.value+='1a'+v+'b';
}
else {
var l=val.length;
var v=val.substring(4,l);
document.forms.fileattr.acts.value+='0a'+v+'b';
}
}
</script>
ENDSCRIPT
}
$r->print('<body bgcolor="#FFFFFF">');
# ------------------ This is trying to select. Provide buttons and tie %selhash
if ($ENV{'form.forceselect'}) { $r->print(<<ENDSELECT);
<form name=fileattr><input type=hidden name=acts value=''>
<input type="button" name="close" value='CLOSE' onClick="self.close()">
<input type="button" name="groupimport" value='GROUP IMPORT'
onClick="javascript:select_group()">
</form>
ENDSELECT
my $diropendb =
"/home/httpd/perl/tmp/$ENV{'user.domain'}\_$ENV{'user.name'}_groupsec.db";
if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT,0640)) {
if ($ENV{'form.launch'} eq '1') {
&start_fresh_session();
}
$successtied=1;
# - Evaluate actions from previous page (both cumulatively and chronologically)
if ($ENV{'form.catalogmode'} eq 'groupimport') {
my $acts=$ENV{'form.acts'};
my @Acts=split(/b/,$acts);
my %ahash;
my %achash;
my $ac=0;
# some initial hashes for working with data
foreach (@Acts) {
my ($state,$ref)=split(/a/);
$ahash{$ref}=$state;
$achash{$ref}=$ac;
$ac++;
}
# sorting through the actions and changing the tied database hash
foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
my $key=$_;
if ($ahash{$key} eq '1') {
$selhash{'store_'.$selhash{'pre_'.$key.'_link'}}=
$selhash{'pre_'.$key.'_title'};
$selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}=
$selhash{'storectr'}+0;
$selhash{'storectr'}++;
}
if ($ahash{$key} eq '0') {
if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) {
delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}};
}
}
}
# deleting the previously cached listing
foreach (keys %selhash) {
if ($_ =~ /^pre_/ && $_ =~/link$/) {
my $key = $_;
$key =~ s/^pre_//;
$key =~ s/_[^_]*$//;
delete $selhash{'pre_'.$key.'_title'};
delete $selhash{'pre_'.$key.'_link'};
}
}
}
# -
}
}
# ----------------------------- successtied is now '1' if in working selectmode
my $idx=0;
foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
if (defined($_)) {
$idx++;
if ($successtied) {
$r->print('<form name="form'.$idx.'">');
}
my ($title,$url)=split(/\:/,$_);
$title=~s/\&colon\;/\:/g;
$url=~s/\&colon\;/\:/g;
unless ($title) { $title=(split(/\//,$url))[-1] };
unless ($title) { $title='<i>Empty</i>'; }
if ($url) {
if ($successtied) {
my $checked='';
if ($selhash{'store_'.$url}) {
$checked=" checked";
}
$selhash{"pre_${idx}_link"}=$url;
$selhash{"pre_${idx}_title"}=$title;
$r->print(<<ENDCHECKBOX);
<input type='checkbox' name='filelink'
value='$url' onClick='javascript:queue("form$idx")'$checked>
<input type='hidden' name='title' value='$title'>
ENDCHECKBOX
}
$r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
}
$r->print(&Apache::lonratsrv::qtescape($title));
if ($url) { $r->print('</a>'); }
if ($successtied) {
$r->print('</form>');
} else {
$r->print('<br>');
}
}
}
$r->print('</body></html>');
if ($successtied) {
untie %selhash;
}
}
# ----------------------------------------------------------- Clean out selhash
sub start_fresh_session {
foreach (keys %selhash) {
if ($_ =~ /^pre_/) {
delete $selhash{$_};
}
if ($_ =~ /^store/) {
delete $selhash{$_};
}
}
}
# ================================================================ Main Handler
sub handler {
my $r=shift;
if ($r->header_only) {
$r->content_type('text/html');
$r->send_http_header;
return OK;
}
&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
['forceselect','launch']);
my %hash;
my %bighash;
my $requrl=$r->uri;
$successtied=0;
# ------------------------------------------------------------ Tie symb db file
my $disurl='';
my $dismapid='';
if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
my $last;
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
&GDBM_READER,0640)) {
$last=$hash{'last_direction'};
untie(%hash);
}
my $direction='';
my $prevmap='';
if ($last) {
($prevmap,$direction)=(split(/\_\_\_/,$last));
}
# ------------------------------------------------------------- Tie big db file
if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
&GDBM_READER,0640)) {
my $disid='';
if ($direction eq 'back') {
$disid=$bighash{'map_finish_'.$requrl};
} else {
$disid=$bighash{'map_start_'.$requrl};
}
if ($disid) {
$disurl=$bighash{'src_'.$disid};
$dismapid=(split(/\./,$disid))[1];
}
# ------------------------- If this is an empty one, skip to next non-empty one
if ((!$disurl) && ($disid)) {
$direction=($direction?$direction:'forward');
($disid,$requrl)=
&Apache::lonpageflip::fullmove($disid,
&Apache::lonnet::declutter($requrl),$direction);
if ($disid) {
$disurl=$bighash{'src_'.$disid};
$dismapid=(split(/\./,$disid))[1];
}
}
# --------------------------------------- Untie hash, make sure to come by here
untie(%bighash);
}
}
# now either disurl is set (going to first page), or we need another display
if ($disurl) {
# -------------------------------------------------- Has first or last resource
&Apache::lonnet::symblist($requrl,$disurl => $dismapid,
'last_known' => &Apache::lonnet::declutter($disurl));
$r->content_type('text/html');
$r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
return REDIRECT;
} else {
$r->content_type('text/html');
$r->send_http_header;
&viewmap($r,$requrl);
return OK;
}
}
1;
__END__
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonsequence.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / rat